django-localized-fields/localized_fields/fields/localized_uniqueslug_field.py

97 lines
2.8 KiB
Python

from django.conf import settings
from django.utils.text import slugify
from django.core.exceptions import ImproperlyConfigured
from ..util import get_language_codes
from ..mixins import AtomicSlugRetryMixin
from ..localized_value import LocalizedValue
from .localized_autoslug_field import LocalizedAutoSlugField
from datetime import datetime
class LocalizedUniqueSlugField(LocalizedAutoSlugField):
"""Automatically provides slugs for a localized
field upon saving."
An improved version of :see:LocalizedAutoSlugField,
which adds:
- Concurrency safety
- Improved performance
When in doubt, use this over :see:LocalizedAutoSlugField.
Inherit from :see:AtomicSlugRetryMixin in your model to
make this field work properly.
"""
def __init__(self, *args, **kwargs):
"""Initializes a new instance of :see:LocalizedUniqueSlugField."""
kwargs['uniqueness'] = kwargs.pop('uniqueness', get_language_codes())
super(LocalizedUniqueSlugField, self).__init__(
*args,
**kwargs
)
self.populate_from = kwargs.pop('populate_from')
self.use_time = kwargs.pop('include_time', False)
def deconstruct(self):
"""Deconstructs the field into something the database
can store."""
name, path, args, kwargs = super(
LocalizedUniqueSlugField, self).deconstruct()
kwargs['populate_from'] = self.populate_from
kwargs['include_time'] = self.include_time
return name, path, args, kwargs
def pre_save(self, instance, add: bool):
"""Ran just before the model is saved, allows us to built
the slug.
Arguments:
instance:
The model that is being saved.
add:
Indicates whether this is a new entry
to the database or an update.
Returns:
The localized slug that was generated.
"""
if not isinstance(instance, AtomicSlugRetryMixin):
raise ImproperlyConfigured((
'Model \'%s\' does not inherit from AtomicSlugRetryMixin. '
'Without this, the LocalizedUniqueSlugField will not work.'
) % type(instance).__name__)
slugs = LocalizedValue()
for lang_code, _ in settings.LANGUAGES:
value = self._get_populate_from_value(
instance,
self.populate_from,
lang_code
)
if not value:
continue
slug = slugify(value, allow_unicode=True)
if self.include_time:
slug += '-%d' % datetime.now().microsecond
if instance.retries > 0:
slug += '-%d' % instance.retries
slugs.set(lang_code, slug)
setattr(instance, self.name, slugs)
return slugs